As manatees can’t survive in water below 60 degrees, they migrate to Kings Bay and the adjacent rivers every winter, which are an average 72 degrees all year round. So from November through March 2012, you can head to Crystal River, which is 70 miles north of Tampa, where it is the epicenter of manatee-watching, and go swim with these giant but affectionate creatures. >>> This looks so fun!
Giola Lagoon/Thassos-Greece The Giola is a beautiful natural lagoon, like a swimming pool carved into the rocks. The water is warmer than the sea, which makes it pleasant for swimming. The place is unknown and the access there is difficult.